Rotary harrow



Sept. 27, 1932. F. ERICKSON ROTARY HARROW Filed Jan. 21, 1932 3 Sheets-Sheet Sept. 27, 1932. F1 ERICKSQN 1,879,666

ROTARY HARROW Filed Jan. 21, 1952 3' Sheets-Sheet 2 Elm warm 2E Eri @1490:

Sept. 27, 1932. ERICKSON 1,879,566

- ROTARY HARROW Filed Jan. 21, 1952 3 Sheets-Sheet 3 Patented Sept. 27, 1932 UNITED STATES FRED ERICKSON, WATERTVILLE, KANSAS ROTARY- HARROW Application filed January 21, 1932.; semi No. 588,007.

This invention relates to rotary harrows and particularly to a harrow embodying two toothed rotary elements mounted in adjoining relation to each other and so mounted that they will rotate in opposite directions, the rotary elements having teeth. V

,A further object is to provide an improved mounting for rotary harrows of this character such that the harrow may be drawn either by horses or by a tractor.

A further object is to improve details of.

parts as a of bars of the other set. At-the intersection construction and arrangements "of will appear more fully hereinafter. c

My invention is illustrated in the accompanying drawings, wherein constructed in accordance with my invention;

Figure 2 Figure 1;

Figure 3'is a section onthe line 33 Figure 2;

Figure 4 is a fragmentary sectional per} spective view showing the two pairs of harrow frame bars disposed in right angular relation but before connection with each other; Figure 5 is a side elevation of one of the draw bars, the transversely extending draft bar being shown in section;

Figure 6 is a plan view of a harrow element having wooden frame members J Figure 7 is a section onthe line"7 7 of Figure 6;

Figure 8 is a section on the line 8- 8 of Figure 7; r v

Figure 9 is a fragmentary perspective view partly in section showing the intersection of the wooden elements.

Referring to these drawings and particu larly to Figures 1 and 2, itwill be seen that I have provided two rotatable elements designated generally 10 and 11, these elements being the same. in general construction.

- These elements'are held apart byJa spacer bar 12 and a hitch bar 13 is operatively connected to'these elements'by the draft bars 1e. Referring'to the detailed figures, it will be seen that each one of the harrow elements 10 or 11 comprises the pairs of spaced bars ground, engaging 15 and these pairs of bars extending par 'allelto each other, the bars 16 beingformed with angular depressions 17 in their length so as to receivebetween thebars and in these angular depressions the harrow teeth '18.

of the pairs of bars as illustrated in Figures 2 and 3, there are disposed the bolts20; Figure 1 is a top plan view of a barrow";

Preferably the pairs of'bars 15' and 1:6 extending'in one direction as illustrated in fFigure 4: are notched upon their lower maris a section on the line 22 of gins as at 21 while thepairs of bars 15 and notched'as at 22 to receive and interlock with the first-named set of bars 15 and 16.

This is also illustrated in Figure 3. Thus it will be seen that the bolt 20 acts to hold these two pairs of bars interlocked with each other at their intersections. The interlocking of the bars by means of the notches 21 and 22 acts to prevent any sliding movement of one set of bars relative to the other set of 24 which define a circle.

Disposed at the center of the harrow element is a plate 25' shown asprovided vvitnv four radiating arms.- This plate is provid ed with a central stud bolt 26 which extends down between the bars at the intersection of the middle bars and is, of course, provided with the nut 27., The arms of the plate 25 p are also bolted to the pairs of bars bythe' bolts 28; Each plate is provided with an up standing hub 29 with an upwardly extendiii'grtapered stem orpintle 3O. Each of the draftbars'l l at its rear end, as shown in Figure 5, is provided with the rearwardly diluv I vergent ears 31 and 32, these ears being upon the ear .31 is a frusto-conical washer 33 "as shown n Figure 2. Resting upon this 7 other set of bars.

angular frame by which draft is applied to metallic bars, I do not wish to belimited to washer is an car 34: attached to the cross bar or spacer bar 12, this car being, of course, pierced for the passage of the pintle 30.

Above the car 34, the upper car 32 is disposed and through the extremity of the pintle passes the'retaining pin 35. The forward end of each draw bar 14: is providedwith a clevis 36 between which and the extremity of the draw bar the draft bar 13 is attached, as shown in Figure 5, this being held in place by the bolt37. It will beseen thatthebars l4 and 12 constitute an approximately/trithe. centers of the rotatable harrow elements and that the member 12 constitutes a-spacer holdingthese elements in spaced relationto each other at all times. V 1 s I VJhilein Figures 1 to 5, l have illustrated; this harrowas being formed entirely of,

this as the rotatable elements of the harrowmight be formed primarily of wooden bars with metal strips applied thereto. This is shown in Figured In this figure, it will be seen that the frame of the rotary element is composed of two, setsof bars 38 crossing each other at right angles. These barsare held inengagement with each other, as shown in, Figure 7 v by the bolts 39, the bars being notched to fit over'each 'other, asshown in Figure 9. Associated with each-wooden bar 38 is a metallic strip or bar; lOwhich extends along oneside or face of the-wooden bar and r is heldto the wooden bar by means of the bolts 41 which are disposed intermediate the intersections between one set of bars and the The metallic strips are also notched out as shown in Figure 9. v

For the purpose of holding the teeth 42- in place, the wooden bars are notched at e3 to receive half the tooth and the metallic bars are pressed out to form a notch to receive. the other half of the tooth as at 44. Thus theteeth are held firmly in position in these bars. 'Associated with the frame thus described is the plate 45 havingradiating arms, the ends of these arms carrying the bolts 46 which pass down betWeenthe-metallic bars 40 andthe woodenbars38as shown most clearly in Figure 6, thus bolting the plate firmly in place at the center of this rotary element. The plate 45 is the equivalent of he plate 25 and hasthe upwardly eirtending spindle or pintle as lIGTGtOIEOTGdQSCI'IbGd and the rotatable element shownin Figure 6 is to. y I

" fielduand distr butes it evenly over the field.

be mounted in precisely the same way as the rotatable elementsshown; in Figure 1. ,The Q extremities of the wooden bars 38 are cone 7 nected to each other by means of thelinksAZ '5 which are bolted attheiriendsto the wooded bars by bolts 48. It will be seen that in both of these structures, the harrow teeth may be removed or new teeth inserted by loosening the bolts 19 in one case or 41 in the other case which will thus permit the bars to separate at this point and permit the removal or insertion of atooth. Thus the harrow teeth may be: readily replaced if they are broken or worn. In both forms of'my, invention, the rotatable'elcments of the harrow may be readilytaken apart and compactly stored. Also in both formsfof my invention, any broken-part may be readily replaced and this without the necessity of disassembling the entire harrow element. The draft bar 13 is adapted to be connected either to any animal drawn draftdeviceor to a tractor. When manner indicated by the arrows in Figure 1.

The rotative ,m'ovement of the harrow elements will cause a'thorough harrowing of the ground and a tho-rough distribution of "anything suchas-manure, straw or the like wlnch may be disposed upon the ground.

this implement is pulled in a direction at right angles to the draft bar 13, the rotatable harrows will rotate in opposite directions in the -Aharrow constructed in accordance with my lnventlon 1s rigid enough to stand the 7 most severe. abuseandmay be'made of any desired weight necessary for the work to be into small ditches as they may be called but will thoroughlyeven down and level and clog up with trash or straw but will continue to distributethe straw or the trash while filling. in ruts andditches.

The'reason for this is that the draw bars 14 converge 'at their forward ends and are pulled together. If they were pulling in a straight line parallel to the line. of draft,

each harrow would rotate first in one direc- 7 tion and then in the other which would leave done. This harrow will not leave straight tooth marks in the ground for water to deepen piles of trash here and thereon the field. It i the outer pairs of tooth engaging bars, has no teeth as shown most clearly inFigure 2. 1 This portion of eachharrow is left empty in case there is too much trash for the teeth to handle;

' The central portion Willthen fill up and then as quickly as the teeth clearthemselvesof without the,necessity of stopping to cleanthe will be noted that the central portion of each harrow, the central'portion being defined by i fharrow out; and furthermore the ground 7 is torn and rutsia 'nd little ditches are leveled whereas the ordinary drag harrowwould not} do this work. The links 24 preventthe harrow from getting caught on fence posts and against trees and tearing off the bark of the trees.

While the harrow is supposed to run level, it is to be understood that there is enough play in the castings for it to work on unlevel ground. This harrow as has been demonstrated by actual use may be used when corn is up to four and six inches, it will tear up the ground and let the dirt fill in around the corn, and kill the weeds.

I claim 1. A harrow of the character described, including a rotatable harrow element, a frame with which the harrow element is rotatably connected, the harrow element comprising a series of pairs of bars running in one direction and a series of pairs of bars running at right angles thereto and interlocked with the first-named pair of bars, bolts passing through the pairs of bars at the intersections thereof, and harrow teeth detachably held between the pairs of bars.

9.. A harrow including a rotatable harrow element, consisting of two sets of pairs of bars, the bars of one set extending at right angles to the bars of the other set, the bars of both sets being notched for interlocking engagement with each other, bolts passing through the intersections of the two pairs I of bars, harrow teeth disposed between the bars of each pair, means for clamping the harrow teeth in place, and links connecting the extremities of the pairs of bars with each other.

3. A harrow including a. draft bar, a rotable harrow element consisting of two series of pairs of bars, the bars of one series extending at right angles to the bars of the other series, the bars of one series having interlocking engagement with the bars of the other series, bolts passing through the intersections of the bars and engaging one series of bars with the other, harrow teeth disposed between the pairs of bars, bolts holding the harrow teeth in position, a central plate having an upwardly extending spindle, bolts extending downward from the plate and between the pairs of bars, the draft bar having ears engaging said spindle.

et. A harrow of the character described, including a rotatable harrow element comprising two sets of spaced bars, one set of spaced bars extending at right angles to the other set and being interlocked therewith, bolts passing through the two sets of spaced bars at the intersections thereof, harrow teeth disposed between the spaced bars, bolts connecting the spaced bars and holding the harrow teeth in place, elements connecting the extremities of the pairs of bars extending circumferentially around the harrow element, and a plate mounted approximately at the center of the harrowing element and having bolts passing down between the spaced bars thereof, said plate having an upstanding spindle.

5. A rotatable harrow element formed of two sets of spaced metallic bars, the bars of each set being arranged in pairs, the bars of one set crossing the pairs of bars of the other set and the bars of both sets being complementarily cut away at their intersections, bolts passing through the intersections of the two sets of bars and holding them in interlocked relation, harrow teeth disposed between the pairs of bars of each set, bolts connecting said pairs of bars on each side of the harrow teeth, and a spindle plate disposed at the center of the rotatable element having bolts passing downward through intersecting bars, the spindle plate having an upwardly extending spindle.

6. A harrow element formed of two sets of wooden bars, one set being disposed at right angles to the other set, both sets being complementarily notched upon their confronting faces and interlocked with each other, two

sets of metallic bars disposed against the side faces of the wooden bars and being correspondingly notched at their intersections, bolts holding the metallic bars tothe wooden bars, boltspassing downward through the wooden bars at the intersections thereof, links connecting the extremities of the wooden bars with each other, and harrow teeth disposed between the metallic bars and the wooden bars, the wooden bars being notched to receive the harrow teeth and the metallic bars being complementa-rily notched to receive the harrow teeth, bolts passing through the metallic bars and the wooden bar on each of the teeth to hold the teeth in place, and a spindle plate disposed upon the harrow element and having bolts passing downward through the space between the wooden bars and the metallic bars, the spindle element having a central upwardly extending spindle.

In testimony whereof I hereunto afiix my signature.

FRED ERICKSON. 

